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	Annual Toxics Summary Stockton-Hazelton Street FAQs Silicon nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		*	*	*	*	*	*	0	*
2012		*	*	*	*	*	*	0	*
2011		*	*	*	*	*	*	0	*
2010		*	*	*	*	*	*	0	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		1200	*	*	*	4000	1050	5	2
2002		92	5400	5180	8500	15000	3120	35	2
2001		890	3800	4850	8800	17000	3530	35	3
2000		500	4200	4620	6900	19000	3430	33	3
1999		960	4600	5160	8100	27000	4640	31	3
1998		940	3800	4840	8100	21000	4060	31	3
1997		290	6500	6170	9800	18000	3730	29	3
1996		420	4800	4570	8500	9700	2780	32	3
1995		750	3800	*	10000	17000	4360	27	3
1994		650	5500	5670	8700	15000	3220	34	3
1993		1000	5600	6720	12000	23000	4770	31	3
1992		990	6400	6510	11000	18000	4010	30	3
1991		1800	8300	9100	16000	26000	5260	31	3
1990		2600	9000	*	19000	24000	6220	17	3
1989		*	*	*	*	*	*	0	*

	Notes:	Values below the Limit of Detection (LoD) assumed to be ½ LoD. Means and risks shown only for years with data in all 12 months. "*" means there was insufficient or no data available to determine the value.